MARSHALL: ON SOME NEW BRITISH SHELLS, I91 



Pegwell Bay, again, is a part of our coast not very accessible 

 nor very inviting to collectors, and was perhaps unvisited by a 

 conchologist until Miss Fairbrass went there. She describes it 

 as " a desolate place, without a house near the shore, and some 

 of the ' Preventives ' live in shelters made out of old vessels, 

 with a boat attached to enable them to get inland in the winter 

 when the marshes are overflown." 



None of the specimens are quite adult ; three are half- 

 grown, and the others about two-thirds. Those from Scilly are 

 freshest and quite perfect. I should not have been surprised 

 had this species been found at Scilly or even at Ilfracombe, but 

 the Pegwell locality is more remarkable, and one of the last 

 places where I should expect this shell to occur. The nearest 

 extra-British habitat recorded for this species is in the laminarian 

 zone at Morbihan, on the coast of Brittany. The following is 

 a detailed description : — 



Shell of a conical shape^ rather thin, opaque, and some- 

 what glossy ; sculpture,' slightly curved longitudinal ridges, 

 which are arranged in continuous oblique rows, crossing the 

 suture ; these ridges are thin at their edges in fresh specimens, 

 and are usually nine in number on the last four whorls, and 

 one less on the upper four ; the first three or four whorls are 

 smooth ; there is also a ridge encircling the last whorl, which is 

 more or less flattened, and is crossed by the longitudinal ridges ; 

 it commences at the upper angle of the mouth and ends at the 

 lower angle ; between the ribs are microscopic lines only • 

 colour milk white, more or less tinged with the animal in fresh 

 specimens; spire tapering to a fine point; whorls 12-13, 

 convex, gradually enlarging ; suture very deep ; mouth nearly 

 round, angulated above and below ; outer lip encircled and 

 thickened by the last-formed ridge ; inner lip very broad and 

 solid, especially at the base ; umbilicus none. Length i -3 ; 

 breadth 0-5. 



